Doug McGarrett writes:
966/2162 Installing shim _15 + git47-222222222.2.x86_64
Rebooted to blank (black) screen with message as follows:
If the shim is missing Grub will not be able to load a kernel. You should in principle be able to boot from a rescue system (it needs to be new enough to has a shim that's been signed recently if you use secure boot). The other option is to drop a shim from the rescue medium into the EFI partition and then retry the boot. You may find other things missing, though, depending on where exactly things crashed.
Is it possible to save this, and if so, how? Have left computer in this condition awaiting answer.
You can mount the system and boot partitions from a rescue system into a chroot environment and then run the part of the install that was incomplete if it's not just the shim that is missing. You should find some information in both the openSUSE forums and elsewhere on the wen on how to do it. I've had to do that about half a year ago, look for a post from me "NVMe drive setup on system w/o NVMe BIOS support" on this very list.